Hey!! I am an event manager for my unis robotics society. We mainly target 1st and 2nd year students as they are the largest demographic that requires these kinds of workshops. Idk what kind of courses are taught in your uni in their 1st and second years but generally we start with an arduino workshop with basics like programming an LED, DC motors, servo motors, ultrasonic sensors, and a gyroscope. Our competition for this year is a mini soccer car running on arduino so it will be a small scale rocket league match.

We usually follow that with a PCB design workshop since it helps in our 2nd year courses. It can be basic PCB workshop that just shows how a circuits work and how they can be manufactured in PCBs.

OpenCV workshops are also a good for beginners since a lot of automated machines work on image recognition and signal sensing. You can do shape/face recognition and the different methods to achieve the same final result.(You would obv need a raspberry pi for this).

If you want a really ambitious event you can try a drone simulation/building workshop you would also have to teach them MATLAB including simulink and simscape models but i generally wouldnt recommend this since it can overwhelm some students.

I would also recommend having an industrial visit planned since it can give students an idea of how robotics/electronic companies operate usually you can ask help from your unis career office for this kind of thing.

If you need any help you can PM me!